Use three different load-factors and document load-factor variable

test/cpp/qps/qps-sweep.sh

@@ -71,13 +71,15 @@ for secure in true false; do
     --async_client_threads=0 --async_server_threads=0 --secure_test=$secure \
     --num_servers=1 --num_clients=0
 
-  # Scenario 3: Latency at near-peak load (all clients equally loaded)
-  "$bins"/opt/qps_driver --rpc_type=STREAMING --client_type=ASYNC_CLIENT \
-    --server_type=ASYNC_GENERIC_SERVER --outstanding_rpcs_per_channel=100 \
-    --client_channels=64 --bbuf_req_size=0 --bbuf_resp_size=0 \
-    --async_client_threads=0 --async_server_threads=0 --secure_test=$secure \
-    --num_servers=1 --num_clients=0 --poisson_load=`awk '$5 == "QPS:" \
-      {print int(0.7 * $6); exit}' /tmp/qps-test.$$`
+  # Scenario 3: Latency at sub-peak load (all clients equally loaded)
+  for loadfactor in 0.2 0.5 0.7; do
+    "$bins"/opt/qps_driver --rpc_type=STREAMING --client_type=ASYNC_CLIENT \
+      --server_type=ASYNC_GENERIC_SERVER --outstanding_rpcs_per_channel=100 \
+      --client_channels=64 --bbuf_req_size=0 --bbuf_resp_size=0 \
+      --async_client_threads=0 --async_server_threads=0 --secure_test=$secure \
+      --num_servers=1 --num_clients=0 --poisson_load=`awk -v lf=$loadfactor \
+      '$5 == "QPS:" {print int(lf * $6); exit}' /tmp/qps-test.$$`
+  done
 
   rm /tmp/qps-test.$$